Can't receive calls but can make them Nexus4

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http://androidforums.com – I am posting for my brother who finally got his N4(and the a few days later his micro sim from straight talk). He went through the steps outlined and got everything working except actually receiving calls. He can send and get texts also he can make calls. I am not sure about MMS but SMS works. What he can't do is get calls, if you call it says something like "the number or code you dialed is incorrect.." He has called tech and the weird thing is they can call his number and it will ring, but no one else can it seems. Has anyone had this issue. :confused::(:confused: Stephen (General)